TY  - JOUR
AU  - Van Langenhove, Leandro
AU  - Depaepe, Thomas
AU  - Verryckt, Lore T.
AU  - Vallicrosa, Helena
AU  - Fuchslueger, Lucia
AU  - Lugli, Laynara F.
AU  - Bréchet, Laëtitia M.
AU  - Ogaya, Roma
AU  - Llusia, Joan
AU  - Urbina, Ifigenia
AU  - Gargallo-Garriga, Albert
AU  - Grau, Oriol
AU  - Richter, Andreas
AU  - Penuelas, Josep
AU  - Van Der Straeten, Dominique
AU  - August Janssens, Ivan A.
PY  - 2021//
TI  - Impact of Nutrient Additions on Free-Living Nitrogen Fixation in Litter and Soil of Two French-Guianese Lowland Tropical Forests
JO  - JGR Biogeosciences
SP  - e2020JG006023
VL  - 126
IS  - 7
PB  - American Geophysical Union
N2  - In tropical forests, free-living Biological nitrogen (N) fixation (BNF) in soil and litter tends to decrease when substrate N concentrations increase, whereas increasing phosphorus (P) and molybdenum (Mo) soil and litter concentrations have been shown to stimulate free-living BNF rates. Yet, very few studies explored the effects of adding N, P, and Mo together in a single large-scale fertilization experiment, which would teach us which of these elements constrain or limit BNF activities. At two distinct forest sites in French Guiana, we performed a 3-year in situ nutrient addition study to explore the effects of N, P, and Mo additions on leaf litter and soil BNF. Additionally, we conducted a short-term laboratory study with the same nutrient addition treatments (+N, +N+P, +P, +Mo, and +P+Mo). We found that N additions alone suppressed litter free-living BNF in the field, but not in the short-term laboratory study, while litter free-living BNF remained unchanged in response to N+P additions. Additionally, we found that P and P+Mo additions stimulated BNF in leaf litter, both in the field and in the lab, while Mo alone yielded no changes. Soil BNF increased with P and P+Mo additions in only one of the field sites, while in the other site soil BNF increased with Mo and P+Mo additions. We concluded that increased substrate N concentrations suppress BNF. Moreover, both P and Mo have the potential to limit free-living BNF in these tropical forests, but the balance between P versus Mo limitation is determined by site-specific characteristics of nutrient supply and demand.
UR  - http://dx.doi.org/10.1029/2020JG006023
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ID  - VanLangenhove_etal2021
ER  -